基于相敏检波原理的电涡流传感器电路  

Eddy Current Sensor Circuit Based on Phase Sensitive Detection

作　　者：董文轩[1] 杜平安[1,2] 于亚婷[1,2] 

机构地区：[1]电子科技大学机械电子工程学院,四川成都610054 [2]重庆大学机械传动国家重点实验室,重庆400044

出　　处：《仪表技术与传感器》2009年第4期6-7,43,共3页Instrument Technique and Sensor

基　　金：机械传动国家重点实验室访问学者基金资助项目

摘　　要：电涡流传感器的输出特性与被测对象的电磁特性有着密切的关系,严重限制了电涡流传感器的使用范围。通过对相敏检波原理的研究,采用相敏检波技术对传感器探头线圈阻抗信号进行正交分解,结合矢量投影方法来消除被测对象的电磁特性对传感器输出的影响。实验表明:在不同被测对象、同一检测距离下测得的传感器探头线圈的电阻分量和电抗分量存在线性的关系,利用归一化阻抗能够消除被测对象的电磁特性对传感器的影响。The characteristics of conventional eddy current sensor are dependent on the electromagnetic properties of the target materials. This paper studied the principle of phase-sensitive detection, according to the impedance vector projecting method,it a- ／ dopted phase-sensitive detection technology to resolve the probe coil impedance signal into the resistant component and reactance component, to eliminate the influence caused by different targets. It was testified by experimental results that the resistance component and reactance component under different measured targets and same measurement distance are linear, and the normalized impedance makes it possible to measure the distance under different targets.

关 键 词：电涡流 线圈阻抗 相敏检波 正交分解 矢量投影 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]